JPS5830607A - Method for measuring cross sectional shape of plate shaped body - Google Patents

Abstract

PURPOSE:To perform highly accurate measurement for a long distance, in the measurement of the cross sectional shape of the plate shaped body, by sequentially moving luminous flux which scans the plate shaped body in the thickness direction, in the longitudinal direction, and measuring the shape from the value of the discontinuous point of the outputs from a light spot position measuring device. CONSTITUTION:A light source 2 and the like spot position measuring device 4 are arranged on both sides of a steel plate 1 having the longitudinal direction X which is perpendicular to the surface of paper, so that they can be moved in the direction X by rails 6 and 7. The light source 2 comprises a laser source 11, a scanner 12, and a concave mirror 13. The position of spot light 14 is changed in correspondence with the rotary angle of the scanner as shown by alternate long and two short dashes lines in the Figure. Therefore, the spot light scans the side of the steel plate in the direction Y. When the spot light is shielded, the light does not reach the light spot position measuring device, and the output of said measuring device becomes discontinuous at this time. When the value of the discontinuous point is obtained with the light source and said measuring device being scanned in the direction X, the cross sectional shape can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for measuring the cross-sectional shape of a plate-shaped body, which is advantageously carried out in order to measure the shape of a projected cross-section along the longitudinal direction of a strip-shaped plate-shaped body such as a steel plate. .

Conventionally, in order to detect the thickness of a steel plate rolled by rollers on a steel production line, etc., the detection end of a potentiometer is brought into contact with the surface of the steel plate, and the displacement of this detection end is measured using a potentiometer. : Conversion is in progress. With such prior art, the thickness must be detected at a large number of measurement points along the longitudinal direction of the steel plate, which results in poor workability and also makes it difficult to detect the cross-sectional shape of the thickness near the rolling roller. Become. Furthermore, maintenance is difficult when the steel plate is exposed to adverse conditions such as high temperatures.

An object of the present invention is to provide highly accurate measurement of the cross-sectional shape of a plate-like body over a relatively long distance.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the section line 1--2 in FIG. In a steel production line, a movable table 3 equipped with a light source 2 is arranged on one side in the width direction (left side in FIG. 1) of a steel plate 1 as a plate-shaped body. A KA-1 light spot position measuring device 4 is arranged on the other side in the width direction of the steel plate 1 (on the right side in FIG. 1) facing this light source 2, and this light spot position measuring device 4Fi is fixed to a moving table 5. Ru. Both movable tables 3.5 can be moved by drive devices 8.9 along rails 6.7 laid parallel to the longitudinal direction of the steel plate l (vertical direction in FIG. 1).

The drive devices 8 and 9 are connected in relation to the servo control device IO, so that the light source 2 and the light spot position measuring device 4 can maintain a constant relative position along the longitudinal direction of the steel plate 1.
You can run on it.

Here, the axis along the longitudinal direction of the copper plate 10 is defined as the X axis, and the
The following description will be made with the axis perpendicular to the axis and along the thickness direction of the copper plate 1 as the Y axis.

FIG. 3 is a simplified perspective view showing the configuration of the light source 2. FIG.

Light source 2F! , a Helium neon lede generator 11, a scanner 12, and a concave mirror 13. The spot light 14 generated from the Helium neon lede generator 11 is
After being reflected by the scanner 12, it is further reflected by the concave mirror 13, and is irradiated parallel to the width direction of the steel plate 10 toward the light spot position measuring device 4. Moreover, the rotation angle of the scanner 12 changes sequentially, and thereby the position of the spot light 14 is displaced in the thickness direction of the steel plate l, that is, in the Y-axis direction, as shown by a virtual line.

As the light spot position measuring device 4, for example, a continuous type detector shown in FIG. 4 is used. This light spot position measuring device 4 detects the signal output line 1 according to the (x, y) coordinates of the position where the spot light hits.
Signals Xi from 5a and 15b.

x2 are outputted, respectively, and signals Yl and Y2 are outputted from the signal output lines 16a and 16b, respectively.

These signals XI, X2 . Yl and Y2 are input to the processing circuit 17, and the processing circuit 17 calculates the first equation and the second equation.
An operation based on the formula is performed.

- The X-axis component and the Y-axis component are determined by the first and second equations, and signals corresponding to the X-axis component and Y@U are output from the signal output lines 18 and 19, respectively.

Note that the light spot position measuring device 4 has four photodiodes arranged in a region divided into four areas at 90 degrees, and a current is derived from each photodiode according to the area where the spot light hits the four photodiodes. A so-called four-part photoreceptor may also be used.

FIG. 5 is a block circuit diagram including the light spot position measuring device 4. As shown in FIG. Output signal line 15a of light spot position measuring device 4.

15btj are respectively connected to arithmetic circuits 22 and 23 via amplifiers 20 and 21 that have the function of converting current values into voltage values. In the arithmetic circuit 22, (Xi-1-X2)
is calculated, and the calculation circuit 23 calculates Vi(X
The calculation I-X2) is performed.

The outputs of these arithmetic circuits 22 and 23 are input to an arithmetic circuit 24, where an arithmetic operation is performed based on the above-mentioned first equation. Further, they are connected to arithmetic circuits 27.28 via output signal lines 16a, 16bFi of the light spot position measuring device 4 and amplifiers 25.26 similar to the amplifiers 20.21, respectively. In the arithmetic circuit 27, (Y1+Y2)
is calculated, and in the calculation circuit 28, (Yl −
Y2) is calculated. These calculation circuits 2
The output of 7.28 is input to an arithmetic circuit 29, where an arithmetic operation is performed based on the above-mentioned second equation.

The outputs of the arithmetic circuits 22 and 27 are respectively input to the arithmetic circuit 30, and in this arithmetic circuit 30, #1(Xi+X2+
Yl-1-Y2) is calculated. The output of the arithmetic circuit 30 is given to a comparison circuit 31. Further, the comparator circuit 31 is given a preset 9-value QT, and the arithmetic circuit 3
When the input from 0 falls below the threshold QT, sample signals are provided to sample and hold circuits 33 and 34 via the delay circuit 32, respectively. The outputs of the arithmetic circuits 24 and 29 are provided to the sample and hold circuits 33 and 34, respectively, and the outputs of the arithmetic circuits 24 and 29 are sampled by inputting the sample signal. Further, when the output of the arithmetic circuit 30 exceeds the threshold value QT again, a hold signal is given to the sample and hold circuits 33 and 34.

Note that the delay time 〒1 of the delay circuit 32 is
．． The time it takes for the arithmetic processing in 29 to stabilize is determined.

In this way, from the arithmetic circuits 24 and 29,
Signals X and Y indicating the @power are output, and signals 5jXM and YM indicating the X-axis and Y@components where the cross-sectional shape of the object to be measured is discontinuous are output from the Sf sample/hold circuits 33 and 34, respectively. .

Referring to FIG. 6, a case will be described in which the cross-sectional shape of the upper surface of a steel plate is measured. We will explain the operation when the spotlight is displaced from above to below and again from below to above so that it protrudes from the upper surface of the steel plate 1 as shown in Fig. 2 along the Y-axis direction at a certain position along the X-axis. do. As the spot light is sequentially displaced from above to below, the arithmetic circuit 28 outputs a signal having a waveform as shown in FIG. 6 f1). (Yl-Y2) gradually decreases as the spot light is displaced from above to below at i above the steel plate 1, and when it reaches the upper surface of the steel plate 1, the light spot position measuring device 4 detects the spot light. It suddenly falls off at Q, where it no longer reaches. Then, when the spotlight again projects from the top surface of the steel plate l, (Yl-Y2) rises rapidly, and as the spot light moves upward from the top surface, (Yl-
Y2) Fi gradually increases.

In the comparator 31Vc, (XI +X2 +Y1 +
When Y2) has a waveform as shown in FIG. 6(2), the threshold QT and (X1+X2+Y1-)Y2) are compared. (XI +
+X2+Y1+Y2) rises when it again exceeds the threshold φ value QT.

The arithmetic circuit 29 outputs a signal having a waveform as shown in FIG. 6(4). In the period T2, the value of (Yl+Y2) is small and the cine is stable. In the sample-and-hold circuit 34, the sample-and-hold signal J shown in FIG.
A signal having a waveform shown in FIG. 6 (5) is output in accordance with ij. Note that the signal shown in Figure 6 (6) rises with a delay of time TI from the rising edge of the sample-and-hold signal shown in Figure 6 (3), and this rising edge corresponds to the rising edge of Figure 6 (4). This corresponds to the rise of the signal from the arithmetic circuit 29. The level of the signal held in the main path (6) in FIG. 6 corresponds to the level /l at the rise of the signal in FIG. 6 (4).

In this way, at a certain position along the X-axis direction, Y
Positions where the spot light is discontinuous along the axial direction are obtained. Since the light source 2 and the light spot position measuring device 4 are moved while keeping their relative positions constant along the X-axis direction, the steel plate 2
The cross-sectional shape within the plane consisting of the X-axis and Y-axis of is measured smoothly.

FIG. 7 is a block circuit diagram for moving the movable table 5 synchronously. Absolute position Xs along the X-axis direction of the moving table 5
is detected by the position detector 35. The signal indicating the absolute position Xa from the position detector 35 is added to the summation point 36
given to. Further, a signal from a moving pattern generator 37 that outputs a good signal according to a preset moving pattern is applied to the summing point 36. The control device 38 controls the drive device 9 so that both signals applied to the summing point 36 match.
to drive. Therefore, the moving table 5Fi is driven in the X-axis direction by the driving device 5 according to a predetermined multiplication table pattern.

FIG. 8 is a block circuit diagram for moving the movable table 3 synchronously. At the summing point 39, there is a 'signal indicating the XM component XM from the sample-and-hold circuit 33, and an appropriately determined x*! 1] A signal indicating the component XR is provided. Control device 40#-t.

so that those signals match, i.e., the X-axis component
The driving device 3 is driven so that the XM component becomes XR, and the movable table 3 is thereby moved in the X-axis direction.

Since the light spot position measuring device 4 detects the relative position of the light spot with respect to the measuring device 4, the absolute position of the light spot is determined by the third equation XaFi.

xa = xs 1XM+C...(31 In the third equation, the difference in the X-axis direction between the point where the output value of the ). Also, x8 is the position detector 3
This is the absolute position of the movable table 5 detected by 5.

As described above, the absolute position Xa of the light spot is determined based on the third equation. Therefore, as shown in FIG. 9, by finding the Y-axis component YM with respect to the absolute position Xa, it is possible to obtain the cross-sectional shape of the plate-shaped body, for example, the shape of the upper surface of the steel plate.

As described above, according to the present invention, the cross-sectional shape of a steel plate or the like can be measured non-contact and with high accuracy with a simple configuration.

[Brief explanation of the drawing]

@ Figure 1 is a plan view of an embodiment of the present invention, Figure 2 is a sectional view taken from the section line ■-■ in Figure 1, and Figure 3 is a simplified perspective view showing the configuration of the light source 2. Figure vI4 is a rounded block circuit diagram to explain the continuous detector, Figure 5 is a block circuit diagram including the light spot position measuring device 4, Figure 6 is a waveform diagram to explain the operation, and Figure 7 is the drive. a block circuit diagram including a device 5;
FIG. 8 is a block circuit diagram including the drive device 3, and FIG. 9 is a graph showing an example of a cross-sectional shape. 1...Steel plate, 2...Light source, 4...Light spot position measuring device Agent Patent attorney Kei Nishi Part Figure 1 Figure 2 Figure 6 Figure 7 Figure 8 Figure 9 a

Claims (1)

[Claims] A light source that emits parallel spot light sequentially along the thickness direction of the plate-like body toward the other side of the plate-like body is arranged on one side in the width direction of the plate-like body, and A light spot position measuring device for detecting the light spot position of the spot light is disposed in the spot light, and the light source and the light spot position measuring device are arranged while keeping the relative positions of both in a longitudinal direction perpendicular to the width direction constant. A method for measuring the cross-sectional shape of a plate-shaped body, characterized in that the cross-sectional shape of the plate-shaped body is measured from values obtained when the output of the light spot position measuring device becomes discontinuous while moving in the longitudinal direction.